How severe is CVE-2026-35054?

CVE-2026-35054 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-35054 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35054?

CVE-2026-35054 affects Xenforo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35054?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-35054 have an EU (EUVD) identifier?

Yes. CVE-2026-35054 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17739.

When was CVE-2026-35054 published?

CVE-2026-35054 was published on 2026-04-01 and last updated on 2026-06-17.

CVE-2026-35054

CVE-2026-35054 is a medium-severity vulnerability in Xenforo with a CVSS 3.x base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.4)
CVSS v4: 5.1
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17739
Weakness: CWE-79
Affected product: Xenforo
Published: 2026-04-01
Last modified: 2026-06-17

Description

XenForo before 2.3.9 is vulnerable to stored cross-site scripting (XSS) related to BB code rendering. An attacker can inject malicious scripts through BB code that are stored and executed when other users view the content.

Frequently asked questions

What is CVE-2026-35054?: XenForo before 2.3.9 is vulnerable to stored cross-site scripting (XSS) related to BB code rendering. An attacker can inject malicious scripts through BB code that are stored and executed when other users view the content.
How severe is CVE-2026-35054?: CVE-2026-35054 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-35054 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35054?: CVE-2026-35054 affects Xenforo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35054?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35054 have an EU (EUVD) identifier?: Yes. CVE-2026-35054 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17739.
When was CVE-2026-35054 published?: CVE-2026-35054 was published on 2026-04-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:xenforo:xenforo:*:*:*:*:*:*:*:*

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